243443300121 has 20 divisors (see below), whose sum is σ = 415613959552. Its totient is φ = 139110456888.

The previous prime is 243443300081. The next prime is 243443300137. The reversal of 243443300121 is 121003344342.

243443300121 is a `hidden beast` number, since 2 + 4 + 344 + 3 + 300 + 12 + 1 = 666.

It is not a de Polignac number, because 243443300121 - 2¹¹ = 243443298073 is a prime.

It is a super-2 number, since 2×243443300121² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243443300141) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 214676065 + ... + 214677198.

Almost surely, 2^243443300121 is an apocalyptic number.

243443300121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

243443300121 is a deficient number, since it is larger than the sum of its proper divisors (172170659431).

243443300121 is an equidigital number, since it uses as much as digits as its factorization.

243443300121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429353282 (or 429353273 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 243443300121 its reverse (121003344342), we get a palindrome (364446644463).

The spelling of 243443300121 in words is "two hundred forty-three billion, four hundred forty-three million, three hundred thousand, one hundred twenty-one".